diff --git a/src/assets/jss/material-dashboard-react.js b/src/assets/jss/material-dashboard-react.js
index f64145a40..17f82e11b 100644
--- a/src/assets/jss/material-dashboard-react.js
+++ b/src/assets/jss/material-dashboard-react.js
@@ -34,7 +34,7 @@ const hexToRgb = input => {
     let last = input[2];
     input = first + first + second + second + last + last;
   }
-  input = input.toUpperCase(input);
+  input = input.toUpperCase();
   let first = input[0] + input[1];
   let second = input[2] + input[3];
   let last = input[4] + input[5];